[6-K] Nebius Group N.V. Current Report (Foreign Issuer)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

September 22, 2025

NEBIUS GROUP N.V.

Schiphol Boulevard 165

1118 BG, Schiphol, the Netherlands.

Tel: +31 202 066 970

(Address, Including ZIP Code, and Telephone Number,

Including Area Code, of Registrant’s Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x         Form 40-F ¨

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

Furnished as Exhibit 99.1 to this Report on Form 6-K is the press release by Nebius Group N.V. (the “Company”) announcing the exercise of the underwriters’ option to purchase an additional 1,621,621 Class A shares in the Company’s previously announced underwritten public offering at the offering price of $92.50, less underwriting discounts and commissions.

INCORPORATION BY REFERENCE

This Report on Form 6-K (excluding Exhibit 99.1) is hereby incorporated by reference into the Company’s Registration Statements on Form F-3ASR (File No. 333-286932) and Form S-8 (File No. 333-286934), including any prospectuses forming a part of such Registration Statements, to the extent not superseded by documents or reports subsequently filed or furnished.

INDEX TO EXHIBITS

Exhibit No.	Description
99.1	Press release dated September 22, 2025, announcing the exercise of the underwriters’ option to purchase additional Class A shares.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	NEBIUS GROUP N.V.
Date: September 22, 2025	By:	/s/ Boaz Tal
		Boaz Tal
		General Counsel